crimson, deep red
紅 centers on a vivid, deep red color: crimson. It is used for rich reds, often with a sense of beauty or intensity.
紅 combines 糸 (thread/silk) with 工, which likely contributes the sound. The character originally referred to a deep red dye or silk fabric.
The thread radical 糸 beside 工 suggests silk dyed a deep, rich red. Picture a bolt of crimson silk fabric.
For コウ, imagine a deep red coat: coat -> コウ, and the coat is made of crimson silk.
deep red; crimson
black tea
red and white; colours for festive or auspicious occasions (colors)
leaves turning red (in autumn); red leaves; autumn colours; fall colors
maple (tree)
lipstick
bright red
deep crimson
red; crimson; vermilion
ruby
the lone woman (e.g. bright flower) in a group
Marubeni Corporation
safflower (Carthamus tinctorius)
red pickled ginger
red-blossomed plum tree; red Japanese apricot
Red Sea
flush; blush
(Chinese) Red Guards
sockeye salmon (Oncorhynchus nerka); red salmon
autumn-leaf viewing; fall-leaf viewing